RCU Forums - View Single Post - 4-Stroking an ABC engine while break-in
Old 01-28-2006 | 08:50 AM
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Default RE: 4-Stroking an ABC engine while break-in

ORIGINAL: DarZeelon
I did write in the tapered-bore break-in thread that the wear on the piston crown, will be greater if break-in is done four-cycling rich.
Which of course is totally at odds with the fact that after 45 minutes of extremely rich 4 stroking (with a head temp of only 145 F) my piston didn't even look as though it'd been run let alone show signs of wear (come on, you've seen the photos of it).

As for my "testimony", without twisting words around, what I said was that because the piston wasn't running in rich and had far more wear when done the usual way, I concluded that an optimal setting would be at or just beyond the 4-2 break and that's what I would use in future.